Nothing specific, just vague recollections of places in central California while visiting the area. I'd stop (or not) with an "Oh wow, I've gone to cheap taco place in Mexico that were less in shambles" in the back of my head.

It's nowhere near comparable to Latin American slums, obviously, but it certainly looked on par with what you see in the Belizean or Mexican countryside. And it was a far cry from what I've ever encountered in rural France, Benelux, or Germany outside of abandoned crack shacks.